Abstract
In view of the problems such as vortex-induced vibration and fatigue of bridge structure caused by wind speed, it is of great significance to study the transverse effect of vortex-induced vibration of the main girder of the main bridge to ensure the safety of the bridge. This paper presents an experimental research method of the spanwise effect of vortex-induced vibration of bridge girder based on symmetric algorithm. The signal amplitude-frequency characteristics of bridge girder are extracted by demodulation method of symmetric differential energy operator. According to this characteristic, a section model of bridge girder is constructed and the correlation between the spanwise effect of vortex-induced vibration and aerodynamic force of the section model of bridge girder is tested. The results show that the structure of main girder is obvious at the angle of attack of +3 and +5 degrees. There are two vertical eddy vibration intervals, and the maximum response of the eddy vibration interval increases with the increase of wind attack angle; with the increase of reduced wind speed, the time history of the eddy vibration displacement of the bridge girder increases and the amplitude decreases; the spread correlation of the lift coefficient for the bridge girder segment model decreases exponentially with the increase of span, and the vortex vibration time gradually increases with the increase of span. It is of great significance to study the vortex-induced vibration of bridge structure effectively and comprehensively, which lays a foundation for studying the spanwise effect of eddy-induced vibration of main girder bridges.
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